Ensure returned versionId is a string when listing objects

Returned versionId is a string when calling statObject(), as it is read
without transformation (casting) from the headers.

However, the xml parser casts automatically what looks like a number in
the responses. Consequentially, when the S3 storage provider returns a
VersionId with only numbers, listObjects() returns an object with a
versionId as a number, which is inconsistent with what returns other
methods like statObjects() and may result in erratic behaviors for the
program using these methods.

src/xml-parsers.js

@@ -222,7 +222,7 @@ const formatObjInfo = (content, opts = {}) => {
     lastModified,
     etag,
     size: Size,
-    versionId: VersionId,
+    versionId: String(VersionId),
     isLatest: IsLatest,
     isDeleteMarker: opts.IsDeleteMarker ? opts.IsDeleteMarker : false,
   }

tests/unit/test.js

@@ -29,6 +29,7 @@ import {
   partsRequired,
 } from '../../src/internal/helper.ts'
 import * as Minio from '../../src/minio.js'
+import { parseListObjects } from '../../src/xml-parsers.ts'
 
 const Package = { version: 'development' }
 
@@ -2078,3 +2079,43 @@ describe('IP Address Validations', () => {
     })
   })
 })
+
+describe('xml-parser', function () {
+  describe('#listObjects()', function () {
+    it('should parse VersionId as string even if number is provided', function () {
+      const xml = `
+  <?xml version="1.0" encoding="UTF-8"?>
+  <ListVersionsResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
+    <Name>some-bucket</Name>
+    <Prefix/>
+    <Delimiter>/</Delimiter>
+    <MaxKeys>1000</MaxKeys>
+    <IsTruncated>false</IsTruncated>
+    <EncodingType>url</EncodingType>
+    <KeyMarker/>
+    <VersionIdMarker/>
+    <Version>
+      <IsLatest>true</IsLatest>
+      <VersionId>1234</VersionId>
+      <ETag>"767dedcb515a0e2d995ed95191b75484-29"</ETag>
+      <Key>file.ext</Key>
+      <LastModified>2023-07-12T14:41:46.000Z</LastModified>
+      <Size>151306240</Size>
+    </Version>
+    <DeleteMarker>
+      <IsLatest>false</IsLatest>
+      <Key>file.ext</Key>
+      <LastModified>2023-07-12T14:39:22.000Z</LastModified>
+      <VersionId>5678</VersionId>
+    </DeleteMarker>
+  </ListVersionsResult>
+      `
+      const { objects } = parseListObjects(xml)
+
+      assert.equal(typeof objects[0].versionId, 'string')
+      assert.equal(objects[0].versionId, '1234')
+      assert.equal(typeof objects[1].versionId, 'string')
+      assert.equal(objects[1].versionId, '5678')
+    })
+  })
+})